Support converting between `anyhow::Error` and `eyre::Report` automatically with `?` #504

Job	Run time
Miri	37s
Rustfmt (stable)	5s
Clippy (stable)	15s
Check (stable)	14s
Test Suite (stable)	13s
Test Suite	2m 47s
Test Suite (stable, --no-default-features)	1s
Test Suite (ubuntu-latest)	18s
Test Suite (--no-default-features)	2m 43s
Test Suite (stable, --no-default-features --features track-caller)	10s
Test Suite (windows-latest)	16s
Test Suite (--no-default-features --features track-caller)	2m 43s
Test Suite (stable, --no-default-features --features auto-install)	1s
Test Suite (macOS-latest)	16s
Test Suite (--no-default-features --features auto-install)	2m 43s
Test Suite (stable, --features pyo3)	13s
Test Suite (stable, --all-features)	14s
Test Suite (beta)	17s
Test Suite (beta, --no-default-features)	15s
Test Suite (beta, --no-default-features --features track-caller)	16s
Test Suite (beta, --no-default-features --features auto-install)	16s
Test Suite (beta, --features pyo3)	16s
Test Suite (beta, --all-features)	15s
Test Suite (nightly)	14s
Test Suite (nightly, --no-default-features)	14s
Test Suite (nightly, --no-default-features --features track-caller)	14s
Test Suite (nightly, --no-default-features --features auto-install)	14s
Test Suite (nightly, --features pyo3)	16s
Test Suite (nightly, --all-features)	14s
	16m 50s

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